// general purpose function to see if a suspected numeric input
// is a positive integer
function isPosInteger(inputVal) {
	inputStr = inputVal.toString()
	for (var i = 0; i < inputStr.length; i++) {
		var oneChar = inputStr.charAt(i)
		if (oneChar < "0" || oneChar > "9") {
			return false
		}
	}
	return true
}
